Use: np.concatenate([a, b]) The arrays you want to concatenate need to be passed in as a sequence, not as separate arguments. From the NumPy documentation: numpy.concatenate((a1, a2, …), axis=0) Join a sequence of arrays together. It was trying to interpret your b as the axis parameter, which is why it complained it couldn’t convert it … Read more
If order is not important and you don’t need to worry about duplicates then you can use set intersection: >>> a = [1,2,3,4,5] >>> b = [1,3,5,6] >>> list(set(a) & set(b)) [1, 3, 5]
You could add it as an extension method: public static T[] SubArray<T>(this T[] data, int index, int length) { T[] result = new T[length]; Array.Copy(data, index, result, 0, length); return result; } static void Main() { int[] data = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 }; int[] sub = data.SubArray(3, … Read more
No, you can’t. The compiler doesn’t know what the pointer is pointing to. There are tricks, like ending the array with a known out-of-band value and then counting the size up until that value, but that’s not using sizeof(). Another trick is the one mentioned by Zan, which is to stash the size somewhere. For … Read more
Defining array with multiple types in TypeScript Use a union type (string|number)[] demo: const foo: (string|number)[] = [ 1, “message” ]; I have an array of the form: [ 1, “message” ]. If you are sure that there are always only two elements [number, string] then you can declare it as a tuple: const foo: … Read more
It is quite simple Find the index of the object using findIndex method. Store the index in variable. Do a simple update like this: yourArray[indexThatyouFind] //Initailize array of objects. let myArray = [ {id: 0, name: “Jhon”}, {id: 1, name: “Sara”}, {id: 2, name: “Domnic”}, {id: 3, name: “Bravo”} ], //Find index of specific object … Read more
Since it doesn’t seem like anyone has done this before I thought it’d be good idea to have it for reference somewhere. I’ve gone though and either via benchmark or code-skimming to characterize the array_* functions. I’ve tried to put the more interesting Big-O near the top. This list is not complete. Note: All the … Read more
If you want to map objects to something (in this case a property). I think Array.prototype.map is what you’re looking for if you want to code functionally. (fiddle) If you want to support older browsers, that are not ES5 compliant you can shim it (there is a polyfill on the MDN page above). Another alternative … Read more
>>> import collections.abc >>> isinstance([0, 10, 20, 30], collections.abc.Sequence) True >>> isinstance(50, collections.abc.Sequence) False note: isinstance also supports a tuple of classes, check type(x) in (…, …) should be avoided and is unnecessary. You may also wanna check not isinstance(x, (str, unicode)) As noted by @2080 and also here this won’t work for numpy arrays. … Read more
Use the Array.filter() method: myArray = myArray.filter( function( el ) { return toRemove.indexOf( el ) < 0; } ); Small improvement, as browser support for Array.includes() has increased: myArray = myArray.filter( function( el ) { return !toRemove.includes( el ); } ); Next adaptation using arrow functions: myArray = myArray.filter( ( el ) => !toRemove.includes( el … Read more